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Originally Posted by BullsEye
Also the IAC valve is it votage or PWM?
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I pulled my IAC off and played with it some. With pin B grounded, 12V on pin A closes the valve completely, 12 V on pin C opens the valve completely, and with no voltage applied, it rests somewhere in between. This "in between" position is adjusted by loosenening the 2 screws on the "electrical" part of the IAC and rotating it.
My guess is that at any given time EITHER pin A or pin C has a 12V PWM signal on it. (PWM means it switches rpaidly between 0 and 12 V, and the ratio of high to low determines the shutter position). Is there anybody out there who knows or can check ?